Quickly know the performance of lithium battery

First of all, we need to know the charging and discharging principle of lithium batteries. The battery has two poles: the positive electrode is a lithium compound, and the negative electrode is graphite. Charge and discharge are the conversion of electrical energy and chemical energy. When lithium ions move between the positive electrode and the negative electrode, they become different compounds. We can think of lithium ions as a charged car: during the charging process, due to the use of the electric field, the car is driven to the negative electrode to store a certain amount of energy (lithium ions are embedded in the graphite carbon layer of the negative electrode); during the discharge process, Due to a chemical reaction, the charged car runs to the anode (where they are removed, leaving the anode in a lithium-rich state). In this process, current appears to supply electricity. Ideally, as long as the chemical structures of the positive and negative materials remain basically unchanged, and the battery has good charge and discharge reversibility, lithium batteries can guarantee a longer cycle. The important purpose of fast charging is to ensure that lithium ions can be quickly inserted from the positive electrode into the negative electrode without causing lithium ion deposition. However, in the current addition, the semipermeable membrane (SEI membrane) of the electrode layer on the anode (graphite) surface will be cracked to a certain extent, so that the electrode material and the electrolyte can be used together, and the temperature can also cause the adverse events inside to damage the battery. The reduction caused by chemical substances is reversible (the lithium-ion car cannot be turned back and forth) and the battery capacity will continue to decrease. Lithium battery charging is divided into three parts: ccpre-charge, CCFastcharge and CV. When the battery of the mobile phone is used up, the voltage will drop. When the battery is below a certain value, the charger will pre-charge the lithium battery with a relatively low current. After a period of time, when the voltage of the lithium battery is higher than a predetermined value, it enters the second stage of high current constant current charging. At this time, appropriately increasing the current can speed up the charging speed. If you are using a mobile phone that does not charge quickly, the fast charging head will not burn your phone under high voltage. Just like you use the iPad charging head to charge the iPhone, the iPad will automatically recognize and input 1A current instead of the original 2A current. Many protection measures, charging voltage and current are in a safe state, as long as the original mobile phone charging adapter is used, it will not bring safety hazards. Summary Does fast charging affect battery life? The answer is yes. Although the materials and design of some fast-charging mobile phone batteries have been improved to allow lithium ions to be quickly inserted and discharged in the battery, high voltage and current will still cause battery loss. But if you are used to buying a new mobile phone after a year or two, or are willing to buy a new battery, the impact will be minimal. At present, most companies that supply fast charging methods do not consider the impact on battery life from the perspective of the battery. However, according to national standards, after 500 times of charging and discharging, batteries with a capacity of more than 80% are qualified, and there is little impact on use within one year. If you don’t want to change the battery and don’t want to use your phone for two to four years, here are some suggestions that might help: reduce the number of fast charging and use it only when you need it; charge when you only have 30% power left, and Not 3%. When using fast charging, do not run large-capacity games. With the speed of smart phones getting faster and faster, under the premise of safety, are you more willing to enjoy the convenience of fast charging instead of shorter battery life? Disclaimer: Some pictures and content of articles published on this site are from the Internet, If there is any infringement, please contact to delete the previous article: How to improve the existing battery recycling process?